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If you have rounded up, it will be an overestimate. If you have rounded down, it will be an underestimate.
well i would think since you pknow how to estimate is that you should give up and take a nap
Since the exact answer is 1.61, 2 is larger than 1.61 and hence an overestimate.
overestimate
You Overestimate when the problem has over 3 digits.